Water-tube boiler.



No. 655,803. Patented Aug. I4, 1900. R. SCHULZ. 'WATER TUBE BOILER.

(Application fiIedOct. 21, 1899.)

4 Sheets-Sheet (No Model.)

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WATER TUBE BOILER.

(Application filed Oct. 21, 1899.)

4 Sheets8heet 2.

(No Model.)

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Patented Aug. I4, I900. H. SCHULZ.

WATER TUBE BOILER.

(Application filed Oct. 21, 1899.)

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No.-655,803. Patented Aug. I4, 1900.

n. SCHULZ.

WATER TUBE BOILER.

[Application filed Oct. 21, 1899.) (No Model.) 4 Sheets$heet 4,

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a section on line 2 2 of Fig. 1 and partly a NI'IE gATENT Fries.

RICHARD SCHULZ, OF BERLIN, GERMANY.

WATER-TU BE BOILER.

SPECIFICATION forming part of Letters Patent N 0. 655,803, dated August 14, 1900.

Application filed October 21, 1899- To all whom, it may concern:

Be it known that I, RICHARD SOHULZ, engineer, a subject of the King of I Prussia, Ger man Emperor, residing at Berlin, Germany, have invented certain new and useful Improvements in Water-Tube Boilers; and I do hereby declare the following to be a full, clear, and exact description of the invention," such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

The present water-tube boiler belongs to that kind in which an upper boiler and a plurality of under boilers are connected by means of a large number of narrow watertubes which in general open into the water-space, but which may, however, open into the steamspace. The separate groups of water-tubes connecting the upper boiler with the under boiler form draft-fines by a number of tubes being placed in close proximityto one another to form partitions in a well-known manner, so that the gases of combustion have to pass a long way through the flues to the chimney and enter the latter with as low a temperature as possible. These draft-fines, in which are formed combustion-chambers containing no water-tubes, are arranged for this purpose in such manner that the main portion of the fire-gases passing first overthe combustion material in the fireplace and entering said draft-fines has before entering the one or the other chamber already transmitted a part of its heat to the water-tubes, and some of the water-tubes are so arranged that a small portion of fresh fire-gases is allowed of entering a combustion-chamber directly from the fireplace and, if desired, together with atmospheric air where the main portion of the fire-gases is entering the said chamber, so as to render as complete as possible the combustion of such fire-gases, the combustion of which should still be incomplete.

Figure 1 of the accompanying drawings showsa section on line 1 1 of Fig. 2 of an example of a water-tube boiler; Fig. 2, partly plan View of the same. Fig. 3 shows a sec- Serial No! 734,358. (No model.)

tion on line 3 3 of Fig. 4 of another example of a boiler; Fig. 4., partly a section on line 4 4 of Fig. 3 and partly a plan view of the same. Fig. 5 shows a section on line 5 5 of Fig. 6 of another example; Fig. 6, partly a section on line 6 6 of Fig. 5 and partly a plan view of the same, and Fig. 7 shows a vertical section of a further mode of construction.

In all examples an upper boiler to is connected with three under boilers b c d.

In the example shown in Figs. 1 and 2 the upper boiler is connected with the under boilers in such manner that there are two groups of water-tubes which open into the upper boiler a and the middle under boiler 0, while but one group of such tubes is provided for connecting the two other under boilers b and d with the: upper boiler a. Each of these groups contains water-tubes e, which are represented as having a greater diameter than the other tubes f and are placed in close proximity to one another and form the par-.'

titions between which the fire-gases pass to the chimney, thereby giving oif their heat as well to the partition water-tubes e as to the other water-tubes f, arranged in the respective fiues, as is well known in water-tube boilers.

In the example shown in Figs; 1 and 2 there are formed two inner draft-fines by means of the tubes e connecting the boilers a and c, and two outer draft-fiues by means of the tubes 6 connecting the boiler a with the boilers b and cl, respectively. The front ends of these inner and outer draftfiues are provided with combustion-chambers h and h, respectively, as seen in Fig. 2. At this end, as indicated by the arrow .2 in Fig. 1, the arrangement of the tubes e, facing each other, is such that open spaces are formed between them, so that a small portion of firegases is allowed of passing directly from the fireplaces g into the combustion-chambers h of the two outer draft-fines. The rear end of the inner draft-fines is separated from the smoke-box 7c and its chimney Z by means of a bathe-plate, while the rear. end of th'ejouter draft-fines opens into the said smoke-box 71). The main portion of the fire-gases passes first over the combustion materialin the fireplaces g and enters, as indicated by arrows to, the

inner draft-flues at their rear end, takes its course to the combustion-chambers h of the inner-flues, and passes from here over into the combustion-chambers h of the outer flues, as indicated by the arrows y, Fig. 2. The firegases are caused to linger as long a time as possible in these chambers, and in this condition a small portion of fresh fire-gases enters the chambers it directly from the fireplaces through the open spaces formed here toward the fireplaces g between the tubes 9, facing each other and indicated by the arrow 2. If desired, atmospheric air may be conducted through these open spaces together with said fresh fire gases, so as to render as complete as possible the combustion of the fire-gases before they reach the smoke-box on their way through the two outer draftflues. Also in the other examples the partition water-tubes are indicated by e, the watertubes arrangedin the draft-flues by f,the combustion-chambers by h and h, respectively, and the open spaces formed between the combustion-chambers h and the fire places g are marked with arrows 2.

In the example shown in Figs. 3 and 4 the upper boiler a is connected with the under boilers b c d, so that, as in Figs. 1 and 2, there are two groups of water-tubes which open into the upper boiler and the middle under boiler 0, while but one group of tubes is provided for connecting the boilers b and d with the upper boiler. The middle part of each inner draft-flue is provided with a combustion-chamber h and the middle part of each outer draft-flue with a combustion-chamber h, as seen in Fig. 4. The main portion of the fire-gases enters, as indicated by arrows 00, all draft-fines at their front end and takes its course to the combustion-chambers h h. Here the fire-gases are caused to linger as long a time as possible, and in this condition a small portion of fire-gases enters the combustion-chambers directly from the fireplaces g, as indicated by arrow z, Fig. 3, through open spaces formed toward the fireplacesbetween the tubes 6, facing each other above the latter. If desired, atmospheric air may be conducted through said open spaces, so as to complete as much as possible the combustion of the fire-gases before their passage into the smoke-box 7c and chimney Z.

In the example shown in Figs. 5 and 6 the fire-gases enter the inner draft-fines both at the front and rear end thereof and pass over from the combustion-chambers 7L, arranged at the middle of the flue, into the combustion-chambers h of the next parallel fines, take then their course toward both ends of the latter, and pass over into the outer fines, through which they are conducted to the smoke-box 70, arranged in the middle part of the boiler- Here also, as indicated by the arrow 2, Fig. 5, a small portion of fire-gases enters the combustion-chambers h directly from the fireplaces through open spaces formed between the tubes e, which face each other above the fireplaces. By this small portion of the fire gases and, if desired, aided by atmospheric air to be conducted through said open spaces the combustion of the fire-gases is completed before their passage into the outer draft-flues and the smoke-box.

In all examples before described the firegases take their course from the fireplaces to the chimney substantially in a horizontal di* rection through the draft-flues.

In the example shown in Fig. 7 the arrange ment of the groups of water-tubes is such that draft-flues are formed, causing the firegases to take-their way in'an upward and downward direction, as indicated by arrows w y, from the fireplaces g to the smoke-box and chimney. Here also combustion-chain bers h h are arranged, which cause the firegases to linger as long a time as possible therein. As indicated by the arrow 2, a small portion of fresh firegases coming directly from the fireplaces g enters the combustionchambers 71/ here also through open spaces formed between the water tnbes e, facing eachother above the fireplaces.

It will readily be seen that the products of combustion entering the inner flues h at their rear end and flowing from their forward end into the outer flues h to escape into the smoke-box 70 at the rear end of said fines h are gradually cooled and carry with them a large proportion of unconsumed carbon {but by supplying products of combustion direct from the fire-spaces, and consequently of the highest temperature and pressure, to the flues h at their forward end, together with air, if necessary, said products of combustion entering the flues h substantially at right angles to the flow of the products of combustion therein, an intimate admixture and the combustion of unconsumed carbon results, so that the forward ends of inner and outer flues constitute, in fact,auxiliary combustionchambers.

Having now particularly described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A water-tube boiler having water-tubes connecting a plurality of lower boilers with an upper boiler, said water-tubes arranged to form main and return-draft flues, and means for admitting fire-gases direct from the firespace to the main flues at or near the point where the products of combustion flow therefrom into the returnfiues, substantially as and for the purpose set forth.

2. A water-tube boiler having water-tubes connecting a plurality of lower boilers with an upper boiler, a portion of said water-tubes arranged to form contiguous flues opening into each other at their forward end, means causing the products of combustion to enter one of said flues at its rear end, to escape from the other at the like end, and openings In testimony that I claim the foregoing as at the forward end of the main flue placing my invention I have signed my name in pres- I0 the same in direct communication with the enoe of two subscribing Witnesses.

fire-space below the flues, said openings ar- 5 ranged to direct the fire-gases into said main RICHARD SOHULZ' fine at substantially a right angle to the di- Witnesses: rection of flow of the products of combus- WOLDEMAR HAUPT;

tion, for the purpose set forth. HENRY HASPERa 

